RAM SINGH AND V.K. SINGH. Pyrite Based Usar Reclamation Work in Central U.P. Indian Journal of Extension Education, India, v. 23, n. 1-2, p. 61–64, 2024. DOI: 10.48165/. Disponível em: https://epubs.icar.org.in/index.php/IJEE/article/view/160458. Acesso em: 14 sep. 2026.